Data Storage Formats

The C166 Compiler offers a number of data types you may use in your C programs. The following table lists these types along with size requirements and value ranges.

Data Type	Bits	Bytes	Value Range
bit	1	-	0 to 1
signed char	8	1	-128 to + 127
unsigned char	8	1	0 to 255
enum	16	2	-32768 to +32767
signed int	16	2	-32768 to +32767
unsigned int	16	2	0 to 65535
signed short	16	2	-32768 to +32767
unsigned short	16	2	0 to 65535
signed long	32	4	-2147483648 to 2147483647
unsigned long	32	4	0 to 4294967295
float	32	4	�1.175494E-38 to � 3.402823E+38
double	64	8	�1.7E-308 to �1.7E+308
near pointer	16	2	16-bit near address
far pointer	32	4	32-bit far address
huge pointer	32	4	32-bit huge address
xhuge pointer	32	4	32-bit xhuge address

Other data types, such as structures and unions, may contain scalars from this table. Furthermore, because of the 16-bit architecture of the C16x/ST10 family, each variable (except signed/unsigned char) must be word-aligned. For example, in structures, a one-byte gap is necessary between a char and an int member.